.problems-page {
  min-height: 100vh;
  background: #e6f3ff;
  padding: 24px;
}
.problems-page .problems-container {
  max-width: 1200px;
  margin: 0 auto;
  background: white;
  border-radius: 12px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
  padding: 32px;
}
.problems-page .problems-container .problems-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 1px solid #f0f0f0;
}
.problems-page .problems-container .problems-header .problems-title {
  margin: 0;
  color: #1a1a1a;
  font-weight: 600;
  font-size: 24px;
}
.problems-page .problems-container .problems-header .start-practice-btn {
  background: #4a90e2;
  border: none;
  border-radius: 8px;
  height: 48px;
  padding: 0 24px;
  font-weight: 500;
  box-shadow: 0 4px 12px rgba(74, 144, 226, 0.3);
  transition: all 0.3s ease;
}
.problems-page .problems-container .problems-header .start-practice-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(74, 144, 226, 0.4);
  background: #5a9ee8;
}
.problems-page .problems-container .problems-tabs {
  margin-bottom: 24px;
}
.problems-page .problems-container .problems-tabs .category-tabs .ant-tabs-nav {
  margin-bottom: 0;
}
.problems-page .problems-container .problems-tabs .category-tabs .ant-tabs-nav::before {
  border-bottom: 1px solid #f0f0f0;
}
.problems-page .problems-container .problems-tabs .category-tabs .ant-tabs-tab {
  padding: 12px 24px;
  margin-right: 0;
  border: none;
  background: transparent;
  color: #666;
  font-weight: 500;
  transition: all 0.3s ease;
}
.problems-page .problems-container .problems-tabs .category-tabs .ant-tabs-tab:hover {
  color: #667eea;
}
.problems-page .problems-container .problems-tabs .category-tabs .ant-tabs-tab.ant-tabs-tab-active {
  color: #667eea;
  background: transparent;
}
.problems-page .problems-container .problems-tabs .category-tabs .ant-tabs-tab.ant-tabs-tab-active .ant-tabs-tab-btn {
  color: #667eea;
  font-weight: 600;
}
.problems-page .problems-container .problems-tabs .category-tabs .ant-tabs-ink-bar {
  background: #667eea;
  height: 3px;
  border-radius: 2px;
}
.problems-page .problems-container .problems-filters {
  margin-bottom: 24px;
  padding: 20px;
  background: #fafafa;
  border-radius: 8px;
  border: 1px solid #f0f0f0;
}
.problems-page .problems-container .problems-filters .ant-space {
  width: 100%;
  justify-content: flex-start;
}
.problems-page .problems-container .problems-filters .ant-space .ant-select .ant-select-selector {
  border-radius: 6px;
  border: 1px solid #d9d9d9;
  transition: all 0.3s ease;
}
.problems-page .problems-container .problems-filters .ant-space .ant-select .ant-select-selector:hover {
  border-color: #667eea;
}
.problems-page .problems-container .problems-filters .ant-space .ant-select .ant-select-selector:focus {
  border-color: #667eea;
  box-shadow: 0 0 0 2px rgba(102, 126, 234, 0.2);
}
.problems-page .problems-container .problems-filters .ant-space .ant-input {
  border-radius: 6px;
  border: 1px solid #d9d9d9;
  transition: all 0.3s ease;
}
.problems-page .problems-container .problems-filters .ant-space .ant-input:hover {
  border-color: #667eea;
}
.problems-page .problems-container .problems-filters .ant-space .ant-input:focus {
  border-color: #667eea;
  box-shadow: 0 0 0 2px rgba(102, 126, 234, 0.2);
}
.problems-page .problems-container .problems-table {
  margin-bottom: 24px;
}
.problems-page .problems-container .problems-table .problems-table-content .ant-table {
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}
.problems-page .problems-container .problems-table .problems-table-content .ant-table .ant-table-thead {
  background: #fafafa;
}
.problems-page .problems-container .problems-table .problems-table-content .ant-table .ant-table-thead .ant-table-cell {
  background: #fafafa;
  border-bottom: 1px solid #f0f0f0;
  font-weight: 600;
  color: #1a1a1a;
  padding: 16px;
}
.problems-page .problems-container .problems-table .problems-table-content .ant-table .ant-table-thead .ant-table-cell::before {
  display: none;
}
.problems-page .problems-container .problems-table .problems-table-content .ant-table .ant-table-tbody .ant-table-row {
  transition: all 0.3s ease;
}
.problems-page .problems-container .problems-table .problems-table-content .ant-table .ant-table-tbody .ant-table-row:hover {
  background: #f8f9ff;
}
.problems-page .problems-container .problems-table .problems-table-content .ant-table .ant-table-tbody .ant-table-row .ant-table-cell {
  border-bottom: 1px solid #f0f0f0;
  padding: 16px;
  vertical-align: middle;
}
.problems-page .problems-container .problems-table .problems-table-content .ant-table .ant-table-tbody .ant-table-row .ant-table-cell a {
  color: #667eea;
  text-decoration: none;
  font-weight: 500;
  transition: color 0.3s ease;
}
.problems-page .problems-container .problems-table .problems-table-content .ant-table .ant-table-tbody .ant-table-row .ant-table-cell a:hover {
  color: #5a6fd8;
  text-decoration: underline;
}
.problems-page .problems-container .problems-table .problems-table-content .ant-table .ant-table-tbody .ant-table-row .ant-table-cell .ant-tag {
  border-radius: 4px;
  font-weight: 500;
  border: none;
}
.problems-page .problems-container .problems-table .problems-table-content .ant-table .ant-table-tbody .ant-table-row .ant-table-cell .ant-tag.ant-tag-green {
  background: #f6ffed;
  color: #52c41a;
}
.problems-page .problems-container .problems-table .problems-table-content .ant-table .ant-table-tbody .ant-table-row .ant-table-cell .ant-tag.ant-tag-orange {
  background: #fff7e6;
  color: #fa8c16;
}
.problems-page .problems-container .problems-table .problems-table-content .ant-table .ant-table-tbody .ant-table-row .ant-table-cell .ant-tag.ant-tag-red {
  background: #fff2f0;
  color: #ff4d4f;
}
.problems-page .problems-container .problems-table .problems-table-content .ant-table .ant-table-tbody .ant-table-row .ant-table-cell .ant-space .anticon {
  font-size: 16px;
}
.problems-page .problems-container .problems-table .problems-table-content .ant-table .ant-table-tbody .ant-table-row .ant-table-cell .ant-space span {
  font-weight: 500;
}
.problems-page .problems-container .problems-pagination {
  display: flex;
  justify-content: center;
  padding-top: 24px;
  border-top: 1px solid #f0f0f0;
}
.problems-page .problems-container .problems-pagination .ant-pagination .ant-pagination-item {
  border-radius: 6px;
  border: 1px solid #d9d9d9;
  margin: 0 4px;
  transition: all 0.3s ease;
}
.problems-page .problems-container .problems-pagination .ant-pagination .ant-pagination-item:hover {
  border-color: #667eea;
  color: #667eea;
}
.problems-page .problems-container .problems-pagination .ant-pagination .ant-pagination-item.ant-pagination-item-active {
  background: #667eea;
  border-color: #667eea;
}
.problems-page .problems-container .problems-pagination .ant-pagination .ant-pagination-item.ant-pagination-item-active a {
  color: white;
}
.problems-page .problems-container .problems-pagination .ant-pagination .ant-pagination-prev,
.problems-page .problems-container .problems-pagination .ant-pagination .ant-pagination-next {
  border-radius: 6px;
  border: 1px solid #d9d9d9;
  transition: all 0.3s ease;
}
.problems-page .problems-container .problems-pagination .ant-pagination .ant-pagination-prev:hover,
.problems-page .problems-container .problems-pagination .ant-pagination .ant-pagination-next:hover {
  border-color: #667eea;
  color: #667eea;
}
.problems-page .problems-container .problems-pagination .ant-pagination .ant-pagination-total-text {
  color: #666;
  font-weight: 500;
}
@media (max-width: 768px) {
  .problems-page {
    padding: 16px;
  }
  .problems-page .problems-container {
    padding: 20px;
  }
  .problems-page .problems-container .problems-header {
    flex-direction: column;
    gap: 16px;
    align-items: flex-start;
  }
  .problems-page .problems-container .problems-header .start-practice-btn {
    width: 100%;
  }
  .problems-page .problems-container .problems-filters .ant-space {
    flex-direction: column;
  }
  .problems-page .problems-container .problems-filters .ant-space .ant-select,
  .problems-page .problems-container .problems-filters .ant-space .ant-input {
    width: 100% !important;
  }
}
